that's next. >> megyn: we're rating for president obama's arrival in waco, texas, where he will speak at a memorial for the 14 people killed in the fertilizer plant explosion in the tiny town of west. now there's questions whether the feds knew about the dangerous chemicals. reporter: of the 14 people who died, ten were firefighters, and now there's word a lot of the firefighters might not have known there were explosive materials inside. and a rot of authorities did not know there was amoan numb nitrate, and those who knew didn't know how much. ammonium nitrate is the same stuff tick mcvey used. it's popular for certain lieser. federal, state, and local authorities are supposed to monitor the site, and some state inspectors had been there several times in recentees but the epa, the department of homeland security, did not know that ammonium nitrate was being stored there, much less 270,000 tons stuff. the last time osha inspected the plant what 28 years ago. it's very unclear even if the local volunteer fire department had plan to deal with an accident, and turns out nobody addressed